[PATCH 3.10 45/54] i2c: ismt: initialize DMA buffer

From: Greg Kroah-Hartman
Date: Fri Nov 01 2013 - 18:07:35 EST

3.10-stable review patch. If anyone has any objections, please let me know.


From: James Ralston <james.d.ralston@xxxxxxxxx>

commit bf4169100c909667ede6af67668b3ecce6928343 upstream.

This patch adds code to initialize the DMA buffer to compensate for
possible hardware data corruption.

Signed-off-by: James Ralston <james.d.ralston@xxxxxxxxx>
[wsa: changed to use 'sizeof']
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Cc: Jean Delvare <jdelvare@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/i2c/busses/i2c-ismt.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -393,6 +393,9 @@ static int ismt_access(struct i2c_adapte

desc = &priv->hw[priv->head];

+ /* Initialize the DMA buffer */
+ memset(priv->dma_buffer, 0, sizeof(priv->dma_buffer));
/* Initialize the descriptor */
memset(desc, 0, sizeof(struct ismt_desc));
desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, read_write);

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